Control the Mouse with the Keyboard in Windows XP

To move your cursor around the screen, you use the mouse, of course.
But if using the mouse is difficult, impossible, or just plain painful,
then why not control the mouse with your keyboard keys instead? To set
this up, do the following:

Click the Start button in the bottom left of your screen

From the Start menu, click on Control Panel

From the Control Panel, double click Accessibility Options

Click the Mouse tab at the top to see the following:

Put a tick in the box where it says "Use MouseKeys", and
then click the Settings button. You'll see the following screen:

You can set the pointer speed to how fast you want it to move when
the numeric keys on your keyboard are pressed (these are the ones on
right of the keyboard. Look out for NumLock. In the image above, we
can only use MouseKeys when this is on).

We've set the mouse pointer speed to High, and Fast. Click Ok on all
the screens, and test it out. With the NumLock on, press the Up (number
8), Down (number 2), Left (number 4) and Right (number 6) arrow keys.
You should see your mouse move around the screen

If you want to access a menu, move the mouse pointer up to the menu
item you want. Then press the big 0 key on the numeric key pad. The
menu should display. You can then use the normal arrow keys to highlight
things from the menu. Press the Enter key to select a menu item, and
to bring up dialogue boxes. You can use the Tab key on the keyboard
to move around dialogue boxes. The normal arrow keys and the enter key
are used to select things from the dialogue box.

If MouseKeys is active, you may see its icon in the bottom right, near
the clock (the icon on the far left, in the image below):

The MouseKeys option can be very handy, if using the mouse is difficult.
You should still be able to use a computer, if you can't use a mouse!